The trading blocks in a lot of ESPN leagues are likely to heat up now that we are four weeks into the fantasy season.Some of the most popular candidates on the buy and sell side of those blocks are the star players who are performing below their initial perceived value level. So what should fantasy owners do when buying or selling these players? What price should they consider as a fair offer?The key to being on the right of this type of deal is to know whether or not the recent struggles of these underperforming stars are due to turn around or if they are indicative of a longer-term issue that isnt likely to get corrected.To help assist with this effort, lets take a look at some potential trade candidates and see what the metrics have to say about their true trade value. Harrison Butker Youth Jersey .com) - Yankee Stadium is the home of the Bronx Bombers, but on Sunday afternoon it will open its gates to host the latest addition of the Hudson River Rivalry. 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The veteran safety was a starter for the Bengals from 2008-2012. He totaled 41 tackles and three interceptions while starting all but four of the 13 games he played last season.Steph Curry is the biggest star in the NBA at the moment, and no one else seems to be able to exist in the same planet. Our US sportswriter Alex Ferguson looks at Currys season and examines how he and the Warriors are changing the game… Its another three-point shot from Steph Curry, this time from nearer the halfway line than the three-point shot. The game is won in overtime, and the Golden State Warriors are one game closer to beating the 1995/96 Chicago Bulls single season record of 72-10 a record they have gone on break losing only lost nine games this season….and winning at astonishing 73 of them. They qualified for the play-offs in March, and quite frankly look unstoppable.Steph Currys season has been unbelievable, smashing more records than a Who concert in the 1970s. He has broken his own NBA record for three-pointers in a season…he actually broke it with 24 games to go. He was aiming for 300, and he ended up with 402......402 successful three-point shots this season. Curry seems to have mastered the art of three-point shooting - and made it trendy Curry is really good at getting the ball away at the other end too - he finished the season with 169 steals, the most in the league.The great thing for Curry is, despite leading the league in points per game average (30.1), he is also an unselfish player playing on a very unselfish team. He is eighth in the league in assists (his Warriors team-mate Draymond Green is seventh). Curry celebrates his spectacular, record breaking three-point matchwinner The Golden State Warriors love passing the ball to each other - they total 28.9 assists a game (first in the NBA), and they love drilling the ball from the three-point line, hitting 41.6 per cent of their shots from behind the arc. The other shooter on the team - Klay Thompson - is No 12 in NBA scoring average to Currys first.Oh, and the team plays defence - they lead the league in defensive rebounds per game average (36.2), led by Green, and have strong shhot blockers too, most notably Andrew Bogut.ddddddddddddBut is Curry better than Jordan? The answer? We dont know. Curry is now drawing comparisons with Michael Jordan - but such comparisons are unfair given they are very different players They are different players. Jordan wasnt Currys 6ft 3in (he was 6ft 6in) and he was a great defensive player as well as an offensive juggernaut. Curry is good at stealing the ball but hes not a rebounder. Unlike Curry, Jordan wasnt a brilliant three-point shooter (.332), but like Curry, he was the player that you want to have the ball in his hands when the game was on the line. And like Curry, Jordan was absolutely unstoppable.Like the dunk fashion that swept the courts in the 1990s, more and more people are worshipping the guy who can score from anywhere. You know, be like Steph and all that.Jordan was a bigger moneymaker outside of the court, but look for Curry to drop some jaws in the 2016 off-season. Curry led his team to the NBA Championship last season The great thing about Curry is that hes changing the game. The three-point shot, which was never as cool as the dunk going back through the years, is suddenly hugely fashionable. Its been a record year for three-point attempts in the NBA (24.0 per game vs the previous record of 22.4 in 2015). Curry is making the change.Why? Because if Curry and the Warriors are shooting so well from three-point range, a game can be finished by the end of the third quarter. Other teams need to shoot well to go head-to-head with the Warriors. Thats why youve got almost half the league chucking up over 25 three-point attempts a game. They are just trying to keep up.Otherwise, we wont just be celebrating Currys Warriors, well be celebrating one of the shortest play-off series in the history of the game. Also See: NFL Video Rookies guide NFL on Sky Sports Pundits ' ' '